Lead pencil



J. B. MASON, JR.

LEAD PENCIL.

APPLICATION FILED APn.30. 1921.

' Patented Mar. 28, 1922.

. at Nashville,

I JAMES BRUCE MASON, 33., OF NASHVILLE, TENNESSEE.

LEAD PENCIL.

Specification 01' Letters Patent. Patented Mar. 2-8, 1922.

Application filed April 80, 1921. Serial No. 465,658.

To all whom it may concern:

Be it known that I, JAMES Bnnon MASON, Jr., a citizen of the UnitedStates, residing in the county of Davidson and State of Tennessee, haveinvented certain new and useful Improvements in Lead Pencils, of whichthe following is a specification.

This invention relates to lead pencils of the 'kind in which the lead iscontained Within a casing and is propelled or fed when required througha suitable guide and through a pointed end or nozzle in such manner thatthe outer end of the lead shall project only a short distance beyond thetip of the nozzle so that while sufliciently exposed for writingpurposes it is not apt to break.

According to this invention spare leads are contained within a magazinedivided into compartments surrounding the longitudinal axis'of thepencil and which is so constructed that when the tip of the pencil isremoved from the barrel, the leads will be exposed and can be readilywithdrawn. When a lead is worn out it may be easily discharged from thepencil and a new lead .placed in working position. The lead in use isfed forwards by a'pusher rod provided with a nut which on ages athreaded tube within the barrel and which extends through a slotted tubewhich may be rotated in such manner as to move the pusher rod back andforth as required. The lead is pushed through a guide tube which gripsit and holds it firmly. The parts above described are at'the lower orouter end of the pencil barrel. In the upper end I provide a chamber foran erasive rubber which is held in position by a clamping device and theouter'end of which is covered by a removable cap. Other features of theinvention will be hereinafter describedl- In the accompanying drawings:'I Figure 1 shows a longitudi-na central sec tion; through a pencilembodying my im-,

provements. 7 Figures 2 and 3 are on an enlarged scale, Figure 2being'a-section on line 3-3 of Figure 1..

" inder containing a chamber in which" the erasive rubber isheld and theslotted tube within which the pusher rod operates.

Figure 5 is a perspective view showmg' particularly the manner in whichthe leads the 'line.2-.- -2 of- Figure1 and Figure 3 being a section onthe rically opposite to project from the magazine pointed end of thepencil is removed.

Figure 6 is a detail view in elevation of the split guide tube forthe-lead within the point of the pencil.

Figure 7 is a perspective view of the pusher rod and its nut.

The barrel A of the pencil may be made of suitable metal or othermaterial. It is internally threaded at its lower end to receive thethreaded end I) of the pencil tip or point B. The tip is thus madedetachable from the barrel. At its upper end the barrel carries a collarC which has a flange a crossing the end of the barrel. This collar isloosely connected with the barrel so that it may be turned thereon.Within this end of the barrel is located a cylinder D containing a whenthe tip or chamber for a stick of erasive rubber E- firmly connectedwith the The collar C is outer end of this cylinder at d and beyond.-

ternally screw threaded as indicated at e' Where it is engaged by a nutF. The outer threaded portion of the cylinder is slotted as this pointthe cylinder is continued and ex shown at 6 so that when the nut F isapextends inwards to the middle portion' of the barrel and is formedwith a closed end 7:. having a central opening in which'is firmlysecured in any suitable .way a slotted tube H which extendsnearly toJtheouter or lower end of the barrel. This tube is of considerably lessdiameter than the bore of the barrel leaving a space around itserving asa leads magazlne whlch'is divided into a plu- .rality of compartments 5by radial partitions I which may be separately applied and secured-inplace ormay with the cylinder milling out recesses or compartments in" atube of. suflicient size.

.There' are slots Ip in the op'fositesides of the tube" H 'asindicatedhese slots extend from the upper end of the tube as indicatedin Figure 1 to near the bottom thereof as indicated in the same figure.Theslots are closed at opposite ends and are diameteach other.Surroundformed integrally ing the slottedtube H is a cylinder K which isinternally threaded. This tube is stationthe partitions I being formedon or sefastened to it and the outer ends of the. partitions engagingtightly the barrel A. The leads in the various figures are indicated atL and when a lead is in working position as indicated in Fi ure 1, it isengaged by a pusher rod M whigh is provided with a nut N which extendsthrough the slots h of the tube H and engages the threads of the tube K.The lower'end of the tube H carries a collar n which is keyed to it asshown and it bears against the lower end of the threaded tube K. Whenthe collar C is turned in the proper direction, the cylinder curely D isalso turned and through the connections shown the slotted tube Histurned, thereby turning the nut N of the pusher rod and the pusher rodis made to advance and push the lead through the tip. By reversing themovement of the collar C, the pusher rod may be moved inwards to makeroom for a new lead or to permit the lead in use to be pushed back intothe pencil.

When a lead is worn out, the tip B may be unscrewed and withdrawnfrom-the barrel as indicated in Figure 5, the pencil being firstreversed. When the tip is thus removed, the spare leads L will projectfrom the magazine and one of them may be extracted, then the new leadmay be inserted through the guide tube 0 and properly positioned. Thisguide tube 0 is slotted at 0 and has a slotted head 0' having a slot orkerf 0 to receive a tool. This screw threaded head is seated in a blockP fastened in the pencil'tip and having a threaded opening 7 to receivethe head 0 of the tube. It will be observed that the lower slotted endof the guide tube abuts against the inclined inner walls of the tip B sothat by forcing theguide tube inwardly or outwardly it may be made togrip the lead to 34 greater or less extent. This adjustment of the guidetube is made before a lead is inserted in it, but when this adjustmentis once perfected for leads of a given size no further adjustment isusually necessary.

The pencil thus constructed is very simple in construction and is easilyoperated. It

may be made at small expense. It is provided with a rubber eraser oflarge size which will last a long time. The leads are held individuallyso that they are not apt to be broken and when a new lead is desired,the operation of merely taking off the tip and securing a lead is verysimple. The leads are exposed as, indicated in Figure 5' so that whentheir ends are uppermost they guide tending through the slots, and athreaded tube which the nut engages which surrounds the slotted tube andwhich is of materially less diameter than the barrel to provide astorage space for leads between it and the barreL- 2. A lead pencil,comprising a barrel, a rotatable cylinder within the upper end of thebarrel, a collar rotatably mounted on the barrel and firmly attached tosaid cylinder, a slotted tube rotatably mounted in the barrel andattached to said cylinder, a pusher rod within said slotted tube, a nutcarried thereby tube, and a threaded tube surrounding the slotted tubeand engaged by the nut which is of materially less diameter than'theinterior bore of the barrel to provide a storage space for leadsbetween it and the barrel.

3. A pencil, comprising a barrel, having a removable tip provided withmeans for guiding a for propelling the lead through the tip, and amagazine for spare leads having inner and outer walls surrounding thepropelling means and divided into individual compartments for the leadwhich are'of less length than the leads and are of less length than theinner wall of the magazine.

detchable tip having inclined inner walls, a

extending through the slots of the 4:. A pencil, comprising a barrelhaving a lead when in use and with means block fixed inside the tip andhaving a threaded central opening, and a guide tube for the lead slottedat one end and threaded at the other, the threaded end engaging saidblock, and the slotted end engaging the inclined inner walls of the tip.

5. A pencil, comprising a barrel, a removable tip carried by the barrel,a guide-tube .in the tip for the lead, and a magazine for spare leadssurrounding the longitudinal central axis of the barrel and which isdivided into a plurality of compartments by rigid partitions whichterminate within the outer ends of the leads in the magazine wherebyends of the leads project from the magazine and can be easily handled.

In testimony whereof, I have hereunto) subscribed my name.

JAMES BRUCE MASON, JR.

